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Pension and Other Benefit Plans (Narrative) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage         100.00%  
Total liabilities         $ 620,283,000 $ 629,687,000
Accrued liabilities         110,816,000 93,585,000
Other non-current liabilities         191,920,000 227,507,000
Charge recorded for contributions to defined contribution plans $ 4,063,000 $ 5,239,000 $ 5,260,000      
Fair value of plan assets at beginning of year 313,366,000          
Fair value of plan assets at end of year 313,366,000       286,678,000 313,366,000
(Level 3)            
Defined Benefit Plan Disclosure [Line Items]            
Fair value of plan assets at beginning of year 5,503,000          
Fair value of plan assets at end of year 5,503,000       1,169,000 5,503,000
Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax         51,540,000 105,878,000
Defined Benefit Plan, Benefit Obligation     446,397,000   $ 404,841,000 $ 459,866,000
Curtailment charge (19,038,000) 0 $ 0      
Employer contribution 1,316,000 10,967,000        
Assumed percentage increase for healthcare costs         6.00%  
Ultimate healthcare trend rate in five years         4.50%  
Discount rate     3.42%   2.62% 2.79%
Net periodic pension cost (benefit) 22,104,000 2,290,000 $ 489,000      
Fair value of plan assets at beginning of year 313,366,000 321,902,000        
Fair value of plan assets at end of year 313,366,000 321,902,000 321,902,000   $ 286,678,000 $ 313,366,000
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]            
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets         283,280,000 257,093,000
Investment Holdings [Line Items]            
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan 3,910,000          
Pension Plans | (Level 3)            
Defined Benefit Plan Disclosure [Line Items]            
Fixed income securities investment return 6,000          
Disbursements $ 4,340,000          
Postretirement Benefit Plans            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax         1,467,000 1,417,000
Defined Benefit Plan, Benefit Obligation     2,348,000   $ 1,388,000 $ 1,887,000
Retirement age 65 years          
Percentage of premium contributed 100.00%          
Discount rate         2.52% 3.17%
Net periodic pension cost (benefit) $ (217,000) $ (134,000) $ (64,000)      
Postretirement Benefit Plans | American Association of Retired Persons            
Defined Benefit Plan Disclosure [Line Items]            
Employer contribution 35          
Defined Benefit Postretirement Life Insurance            
Defined Benefit Plan Disclosure [Line Items]            
Net periodic pension cost (benefit) $ 141,000          
Total liabilities         $ 4,682,000  
Accrued liabilities         4,544,000  
Other non-current liabilities         138,000  
Cash Surrender Value of Life Insurance         $ 3,496,000 $ 3,346,000
Maximum [Member] | Equity Securities [Member] | Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage       35.00%    
Maximum [Member] | Fixed Income Securities [Member] | Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage       65.00%    
Minimum | Equity Securities [Member] | Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage       45.00%    
Minimum | Fixed Income Securities [Member] | Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage       55.00%